The whole thing might be just

来源: mdgg 2007-09-08 19:11:29 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读: 次 (395 bytes)
some sort of over reaction because of misunderstanding.

Who using what method diagnosed what kind of primary embryonic cardiac mesenchymal tumor of the fetus???

But to answer your curious question:
1) cells/tumor do not cross blood-placenta-barrier unless the tumor metastasized to the placenta
2) yes, in many medical conditions such as significant deformity of the fetus.
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